Cのプリプロセッサ on Go言語

hello_cpp.go

package main

import (
  "fmt"
  "strconv"
)

#define map(TYPE_S, TYPE_F, SOURCE, FUNC)\
func (f func(TYPE_S) TYPE_F) []TYPE_F {\
  r := make ([]TYPE_F, len(SOURCE));\
  for i, e := range SOURCE {\
    r[i] = f(e)\
  };\
  return r;\
}(FUNC)

func square(x int) int {
  return x * x
}
func main() {
  numbers := []int{1,2,3,4,5}
  result := map(int, int, numbers, square)
  fmt.Println(result)

  fizzbuzz := map(int, string, numbers, func (x int) string {
    switch x % 15 {
      case 0: return "FizzBuzz"
      case 3,6,9,12: return "Fizz"
      case 5,10: return "Buzz"
      default: return strconv.Itoa(x)
    }
  })
  fmt.Println(fizzbuzz)
}